@mixin full-height() {
  height: 100%;
}

html {
  @include full-height();

  body {
    @include full-height();
    width: 100%;
    position: absolute;

    .chat {
      // position: absolute;
      // width: 100%;
      // @include full-height();
      // display: flex;
      // flex-flow: column nowrap;

      .welcome {
        padding-left: 3rem;
        padding-right: 3rem;
        // flex: none;
        position: fixed;
        top: 0;
        width: 100%;
      }

      .messages {
        // flex: 1;
        margin-bottom: 5rem;
        font-size: 1.7rem;
        list-style-type: none;
        padding-left: 0;
        position: fixed;
        bottom: 0;
        z-index: -1;
      }

      .send {
        // flex: 0 0 4rem;
        position: fixed;
        height: 4rem;
        bottom: 0;
        background-color: #aaa;
        .full-height {
          @include full-height();
          .full-height-change {
            display: inline-block;
            @include full-height();
          }
        }
      }
    }
  }
}
